Despite several prior unsuccessful attempts to simulate the Beryl Formation in the Beryl Field, one of the North Sea's most complex, an integrated reservoir management study was initiated in 1990 which has shown that modelling such a field can be successful with worthwhile results. The conclusions from the study have led to a new understanding of the displacement mechanisms in the Beryl Formation, and have resulted in a change to the depletion strategy under gas export. The impact on volumes and reserves has been significant.

The first successful history match on Beryl was achieved by the integration of new interpretations of reservoir structure and stratigraphy, the results from a conceptual model developed from the analysis of fluid movements and pressure regimes, and a good approximation of the depth-dependent fluid properties into a coarse grid full-field reservoir simulation model. The model exceeded its initial goals, and with subsequent enhancements has been able to provide answers to more detailed questions than considered possible at the outset of the study.

This paper describes the methodology and techniques used to ensure the success of the present reservoir management study, the importance of data acquisition, and how the present simulation models will be further developed and applied to ensure the optimal depletion of the Beryl reservoirs. It also discusses how the scope of the project has been broadened to provide a means for the evaluation of marginal satellite field developments through the Beryl infrastructure, thus providing the necessary tools for optimising the use of the Beryl complex by modelling the multiple reservoirs and future satellite developments as a fully integrated system.

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